How hard can it be to know what date it is? Or will be? I could safely state that 64-bit Unix time will run out on December 4 in the year 292,277,026,596 CE because the Gregorian calendar is very predictable. In the short term, it is super easy and loops every few years. Allowing for the two types of year (leap and normal), and the seven possible days a year can start on, there are only fourteen calendars to choose from. When I was shopping for a 2019 calendar (non–leap year, starting on a Tuesday), I knew it would be the same as the one for 2013, so I could pick up a secondhand one at a
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